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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee81c4b77d9a57bef72a6fb6448aef43e1bd9897f8a05ec0606d55a853a3ff9' 
  AND token = 'p5ksMb63h0qzFOMLYu9wGKYivU2SzU8wa9rdOLnqMSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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