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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbe6440611081bbcace5449b38b90a25dcf31946ae6e2e8fa0e2ab1067bbb3b' 
  AND token = 'W+v/H4++vSCzEoWGgqdscWQoNOKNx0WKwX+3WUFvWuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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