Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef29083e44f8359264bdb656b35ba693c16ce1973d63bc2fd14abfd25d900d6a' 
  AND token = '+AOJTjepgSjb98HJ6s1swlEzE2mR8B3LGM4TzB5nuUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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