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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054371d077ac082b66d89530a3a4a3843df247bc19239a5c9bcd9fdac9c2a3b6' 
  AND token = 'aDu6zfsK/LidpTn7aCwku6OHnCqoHEHZqCrsFgzHPJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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