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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d2b64c2f65270346d304d5edeb4fdc6615a0d0e6ede9c7c806008bf86d39b19' 
  AND token = 'E97Nq2VKnPVIXCgjQ5jC14PvcWR6whbRVUY57OJlEnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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