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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3004e36e1310200472544725bd1523a232064a694cf0a3ed2ee9814d08fadd47' 
  AND token = 'NDFVBloQeL4IQ6NhYB7B9oab6G0h/Jm9LOxmUBkmKjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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