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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ffa00b86cdeab2de091f4106254982b840f39aaf904a9bd37b38e6dfae1e4a' 
  AND token = '+9SPEzL2r5bWiXTluKpuPg2W9MhCFyG5Ff+lpZNpngA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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