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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d22da135c6e2535d4c796b4a58dc9dcb5468ec35158cc39197d3c78a9273d8' 
  AND token = '7HJd0GBW9u2T6YwjljjFHyUrJb0heWDHxjt1XhIJOCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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