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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837b48521095637473cb23994837460437a7c3a49e63ccafc96540fc86b73117' 
  AND token = 'kEexHsIEJ0b0XA/JzI+j4fI+EOYLFTIA9jrfS5/z46A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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