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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae89ff6b8acd84a941217bdb2bd2d06640328f7e5af92a5dac0e2f243a24baed' 
  AND token = 'UG1faVfyg8hvi0+dYyqbAX9dkcWZ/2AO1REhiAiOjok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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