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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '870753e067d7bb4b808627828ed6ba5a8d5e4c5aaa5e786ae3408dc88091c578' 
  AND token = 'qHsZ6jDaiCJFb2+hupFUelFRYWxAXxao+EZTrcsFGtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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