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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc554d0acb997ca867e08eb62905efe36f2035dc566b47d0c791cf51d5d873c' 
  AND token = 'FjJqVTSYjM7sb2TF7qUc2l6F728JlvK8x5SqWoiHj8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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