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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089d82a7332e424ca6d5853ffa82d1baaa3540e5de88b535c72f20791c88ba61' 
  AND token = '/C2dbyE/IrXqP7amvUx7A5XWGXrwpB0+QkFPL/4bMG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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