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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10cdc7153953330a40bd6c9ac2739a8a25a6b2318ce3379b50c7cebbfad7506' 
  AND token = 'NTtvAr36KSy5Rm1gwX1xEVzbgOWcSYpqyqXqyEHcWt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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