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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11517617c4f3bfd2edeaaa16b87c2f774f7f34cf89304e028fb435e27ece259' 
  AND token = '/FsXLS8ETADrJ9tUcFHcEvFdYJjmD5rzpyqRnfl14ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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