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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c3bdb17953ed415fbfbb4a929220547631330898b38cf58c3f1c1d3c1e2125' 
  AND token = '+/+/lMAEJ2cIEC8kUpAbtIGuxOGJQRT1kg3qvOC7twc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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