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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '605d871f16da84eff005e1dd17926e6ed944afb5b3953d1cfc085f56f8941957' 
  AND token = 'XPLv4dEZ/2/XoljRyNg44Z2nRFVPduv5JY1XoCPuCAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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