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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793462ab0a6dc6915e8e0371a5aac6b8d7aee1b80e75e8775872333233c15611' 
  AND token = 'Gj0saZ4XLpQIyl3yvV86N2+VptTu5DPSPLjHPKnOZzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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