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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '772cf7154e34a9e9f71dc1fa9ad2ba63dd67610c126b54f9523141a05c37f45e' 
  AND token = 'BlLlDeIRzlVUAjsFplS+Rl4WW1ZMae42ytxAlwfnRpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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