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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f09c8a07e9f8ac5ad3ad5a0d3a72ef3d4e814b9ad3d59cdbf34818f9f64026' 
  AND token = 'CsI4RvK8z2AXjnXpbH+yFmphescpzngA1xg2cyqIXVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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