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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be326186f60659c4d6748c051369533f7ee1f6c39e45dbac06a02be11329a8df' 
  AND token = 'pBoVbsTXAiw1Z4zN7Izy8PvGIn9hiixaK35WfqEDuGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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