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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be9d9e8542cf3609982bbcae3eafe2200de8ddfb2aa71d8cbefbb3876804d11' 
  AND token = 'RwWKRtDu89pUZ2rH1WTjmzafD1csLF2RkXPuuard+H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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