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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6090c3c0c8c0acf2e7e18fef8bc9f9c061cbad8ae8a4689ec310a3bcc90a3812' 
  AND token = 'PDEdXkiDyyntxVusKWxDImH+ZlXroehOr7UR2PbRw3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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