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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22d322874d5302e832ebb0972d9a7afc41fabaa359afc7a32fd04582e8abfe24' 
  AND token = 'hRSbwvzMQ3mW6SMoGkFkiU3aS+HyeOOFa7xAn27iBiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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