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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b704d0d7779d7b24c7f74ac4df74b15cbbb7531661f70a2408b5fe49c918c627' 
  AND token = 'zTzOBF/bXk/7yibLeoO8JkowVzv+zDms+aeFhxMHMsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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