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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8079e0d759af2eded6a2f58d7f3c1936fd0ac196a7e6901abbc63a82c75ffe' 
  AND token = 'OH+TircJbynKTpkYgJept8JukjTtcKHBqcUnj0rT4KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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