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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b52d4f524f7c00a7b78eb2e4eb5d8d376f94cf3b2e3da18bb1cac534e0473e' 
  AND token = 'Th7QHoSYgMdBdAhl8/P5lynGNFl3qGWcWyGSPtOnPp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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