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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beec72f8ec92d07ee6f03051389c576f2f406fed639f76b6c0ca56c2d3ac0dc7' 
  AND token = 'RhGwDwrqd8KhpG+iiVEY/Yqdfyirfvt7ouDj7YGQpTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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