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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8086c7afedd0e8c83caeb91c6b5437fb4e6c36ccc829c820b85d73aac55ac642' 
  AND token = '/WWp/2scAOcG4oY15JLnmvhDNx4sjjwfeNme/GzaZSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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