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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2705deffef81c71f5036a01ccb8137f6bf843ce29b0790003472b68d8999e7ac' 
  AND token = 'A+G6UdYAhBMUf4L5gcSU4iICd9lwFin7Fq3XHenUaI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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