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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca500699d9ba135b6cae79407eabeda0092dec8def6a2a0b0ed2bfb630bca7c' 
  AND token = 'k2VUwxdBoN6VT+Ll9MZOMuC/W2bUhFfbfKXaMwcrEH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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