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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a7e599ccd657b51eff4d3d09ddcc2359c3cf34d719e52227795ace22cc6d79c' 
  AND token = 'NaELkCzzoDC6/QZ/TgHHcAQEi9bBhBjiZUVFBFTQ5SQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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