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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdbb3e99c819e5b8322761f92c4d8804d924a01b52ee65466c62e0f5c29c1a17' 
  AND token = 't93mCehrl/C/DQ/db9WnY3p62TrQfagq7cbg59uwXMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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