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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce30b9f5b036f497e1d1d5676ad174bec0775fa7d7cf39a41bcaf3defa96dd6' 
  AND token = 'Lt7Xce33ucP8C/B7QSSXold6+NtH1pJ65kML8hhmQ7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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