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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b085f71b207815cf7799577448a59f764f135c740aaa0a1a08df0355fcfa9cab' 
  AND token = 'WCeZn873cb+0O+6ylWoxhI/cGC29fhaUzqZsHxys5kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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