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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772721434dfd0e7321a785afa88ef5f269effe2c91f3ce023039c3196845516e' 
  AND token = 'jQ5VLCQqsP61j4SIt4q1FVsrxwNYQd/fFoUg2IHHpuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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