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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1b22fa9f5042043c302ec2ace5e5914a71976d464e95f6f2c330a0c78732e0' 
  AND token = 'Jng7jXyY1QNpTkrrMoYnuYiWWOPU+BP4iIFIMOscq/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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