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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b10625fa0e369ec4eb0b93797c3686774c5b3efea45de232280125024240152c' 
  AND token = '5YyuNa7kUA0tnv4tsn8nRfKF7e7vcAw5RetfXTUF3aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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