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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8214a33866349468a5e0536ba8eba07b8f1ba89cb6cd214c587fdf91e2d21296' 
  AND token = 'l/NEK8zoIatK31oRDqvzyPg9Le2NtOEiN3svzPYNouU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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