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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92fbe7a23d9e1596b5868c055e45e52037b3c27f13e521cebdc363af52b94293' 
  AND token = '3PsUcVhpNO0xIKPXTe4lj0HP6gt2r2Aa4euHXcFAvoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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