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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57febfba008b9e18d04f474323b9ccfac10429129a9378ad707a6eee3ca9ef8' 
  AND token = 'jsMn7cVLUs7I8W9jxr8tbckfexx8xDZL7Q0tdl+rFz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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