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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952df2df785ca4bb16e19f7d21bdd48de176a5f2f59de413f7ca8260740697fe' 
  AND token = 'oLy3dnYEv/BvcrRHYkiXXSBbPioTL+ct9yKqJmSBHlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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