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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48624d2992b6105a120412acc76d97a061c232e3ea8cd28f21449b3c01d3e16e' 
  AND token = 'Y0zta3jKxg8hR7rxf1/IfKfmVxQwdj2sbam08HiRjHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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