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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f7b353305bef052e79517209d988e55fb6d85feb5d96fdba735457ee1ea198' 
  AND token = '7LB4A2v5xhtRmX3DTmm0Ffjs8sYC1VsRI2kxXg0r5yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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