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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27f861a0baca0f63187b95259c712ca7c8c2a47cfeeff032fef14ae1c71036a' 
  AND token = 'VmktCkD/UFRtlySZTSk+N8EgEmAGxjs1PpnlGD0ncPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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