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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04c222ae4f69507a7fb7d44c9f9e08a3eafbb8592cbc26c3ed6489ec4b928d9' 
  AND token = 'WP3w5Q5nsQcY/BRPyxW4BCTA3EKHNensBwqE3d2GuE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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