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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f898e62f8c46217a018fd0a11c783e921ea3dff01fa9e67b604294de19c18bc4' 
  AND token = 'knIvCH46Xn4n8Vq4tLk/M7znwqdfkK7C9YCa60ulC0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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