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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89185068e93e98cfebcb9e3f7c98acbdaa541ceb83df3e04a651984790fe2e7' 
  AND token = 'gRfskzkgS/ksUD12Yk6FVgzTkMcMOEid8WGkaoPzVgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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