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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7ddcdee3ecf913cbec8a8aa6d7939a3b0e87a017fbda3e052aeb952b21bbf6' 
  AND token = 'Ae2rKXVoMlR8hIhoDXl2w3QP+myuD/Osi7Y42DKBp3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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