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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c436035f6871b34ff6bdb1740ff8639bff67579859f2ce8acec839243ccbf5c' 
  AND token = '7pCHT6sHi4VNWciHvW8tbM3nMdPIqYKYt2KT8F9phww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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