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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032a7122301eb7bbb22d48ca2a1456055bd1a7ee529fc9ca99fad7d4af0a5c28' 
  AND token = '8WfzILgMBhjFRq56TM7YC0/Qd0B1hbpYzfgpiFv3/Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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