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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86589d11c91e2284cb440d8d3f2af7be457a24beefa29330b4bd5feeb0cc632' 
  AND token = 'LIMvsyoZ2wI0z7ZyFTqcC7Zy4lwJA9DdNs5eGJ/dLKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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