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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238c423dd13a194b83b3d0e297b8cb078d85ad7ee5cefc7bd9c602597cf72b8c' 
  AND token = 'O1emUgfxou74oHCzU5bNzFbFj4naIhieo+9Z8Ory6fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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