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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce82543ff8237af6f0f3f34952e0276884ba6b9be9c75be01e862ebc530f6ed2' 
  AND token = 'n8ezmN1Nqeew4Rmn1751Jlrq6EWn+uisi1bRTCJICUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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