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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5010a13a1eb5955d53ca09b325abf3a654ee7912e133624344ba60eb2cce326b' 
  AND token = 'Jj8G+T+kSOQg9YN5GjkrlXkxwrIcyZ13OOyZHs2Kmak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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