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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aade6740bf1f4be0950a2bc4b4b06c491bcc3ffdf552d09485a9dc8045334e5' 
  AND token = 'tP/xZE6WsSfvfSth6NG/34t/8iEN+4ve3c1J/G53S4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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