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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00e14d4d4fe1dc3438d1b5ef2572987c78e7eb20bc4e0b8da1237b6111f1fdf' 
  AND token = 'bGgTzEohDvD450+We+qqVq5NTErxl36meDNn5e3dJ68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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