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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '810a968f15dd1aeb467d5958081f62e2d42da2dd6d66ed8def0a4023a327e9ae' 
  AND token = 'MpySRLejySI9RFM8n1yIojVarY3ZPDJ91aeXWj34S7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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