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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b626d346b4bf40fd578eb8a6177834a3a9600776576098b5329fa27d22a5731' 
  AND token = 'W739lTG+c+QPtX6POfCfnWSl2uvkn2VEnkZXZLCeVn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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