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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bacf7d4021b778707b5c74915ab18007477d03dce01eb04c27e83e99340514f' 
  AND token = 'RRZ6AzDnjU7pk1iqqBX2NVaFx/ECiHvKguOJBmZ5iO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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