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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a6beee23b5c94e946e79475892cd2e262e82b48179d85e8a0e209df438afe3' 
  AND token = 'HuPKBQzdpM2nwlt7T++5kU7aQJgBnMENNQcqUSUAy0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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