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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11efa559b57418a77da776778f4cc5583cca22ef0c443dc13e8234894a6c1b9b' 
  AND token = 'NlSdqSdj1PsyhKuWqxcwTv2YrhCTLlk7RRo8j1GP//E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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