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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02906d39a4d54d9331ea1eff3d07f4ca5b28c7a370474eef31f2a6da6d6d3032' 
  AND token = 'M+do7pjoRkKJkprXx6FUOviI4zx1HD+502ak+oASli0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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