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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6a49540faa258356f71132df90272b9b542d32510a2b87e4c96020ca6e77872' 
  AND token = 'ykYF/Aeu/AvXA9Z2s0Dhfx7VKFRlSl1wUCISc7iW3Rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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