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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15eb383b2cc06ede88b2c86a5165d5c5a666b4a43e2882751c1a993dddd8a7e1' 
  AND token = 'awZff84dFp0p7uGdqISoOBgNBnPW7WlJEnfq4KAhdpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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