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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3225c5f1615495f23a76d1496ee70dc0aa31ed8e7a2ed27c516e0bfc470865eb' 
  AND token = 'Dp5crmU71AwhME5IHOnq9Ml5pwXJybvPIl/3pz/kPME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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