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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2142e26ac6469387d92ac4869a98d3cfa0a8dccf282815c06d19617d5721b927' 
  AND token = 'i5YiSvKQ4DSrT2sg9Rxi3BWeX6h6rmO8My3z3SYEszs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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