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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd5fa268053007cf3a4266df29b6bf35aedb4bc9503ad48d299c4f2d395747b7' 
  AND token = 'eouKSu9o6zfqWO86RjKdrkLlu7+TsSf1rIg6SMb77nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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