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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a2377afb146968b34f864c6a1ea32a70ada4770e0320a29eb6d6ba62a48585' 
  AND token = 'VR7zYSEv7t8g3ROC4EGnMOFp9iIKwLGL88uajGLDYyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}